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| author | Luka Gejak <luka.gejak@linux.dev> | 2026-05-18 16:23:11 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2026-07-04 13:43:33 +0200 |
| commit | 53fed4061a09755de99c89fdc7fae5b794da455f (patch) | |
| tree | 3765491e91f9971e94c2c56dd98ce9624156243c | |
| parent | 81e2d4508b35c6b0d42291b055b85e5889a3f0ba (diff) | |
| download | linux-stable-53fed4061a09755de99c89fdc7fae5b794da455f.tar.gz linux-stable-53fed4061a09755de99c89fdc7fae5b794da455f.zip | |
wifi: rtw88: usb: fix memory leaks on USB write failures
commit 6b964941bbfe6e0f18b1a5e008486dbb62df440a upstream.
When rtw_usb_write_port() fails to submit a USB Request Block (URB)
(e.g., due to device disconnect or ENOMEM), the completion callback is
never executed.
Currently, the driver ignores the return value of rtw_usb_write_port()
in rtw_usb_write_data() and rtw_usb_tx_agg_skb(). Because these
functions rely on the completion callback to free the socket buffers
(skbs) and the transaction control block (txcb), a submission failure
results in:
1. A memory leak of the allocated skb in rtw_usb_write_data().
2. A memory leak of the txcb structure and all aggregated skbs in
rtw_usb_tx_agg_skb().
Fix this by checking the return value of rtw_usb_write_port(). If it
fails, explicitly free the skb in rtw_usb_write_data(), and properly
purge the tx_ack_queue and free the txcb in rtw_usb_tx_agg_skb().
The issue was discovered in practice during device disconnect/reconnect
scenarios and memory pressure conditions. Tested by verifying normal TX
operation continues after the fix without regressions.
Fixes: a82dfd33d123 ("wifi: rtw88: Add common USB chip support")
Cc: stable@vger.kernel.org
Acked-by: Ping-Ke Shih <pkshih@realtek.com>
Tested-by: Luka Gejak <luka.gejak@linux.dev>
Signed-off-by: Luka Gejak <luka.gejak@linux.dev>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/20260518142311.10328-2-luka.gejak@linux.dev
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/net/wireless/realtek/rtw88/usb.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/net/wireless/realtek/rtw88/usb.c b/drivers/net/wireless/realtek/rtw88/usb.c index 52b83191f325..b3e1e9a0fda6 100644 --- a/drivers/net/wireless/realtek/rtw88/usb.c +++ b/drivers/net/wireless/realtek/rtw88/usb.c @@ -398,6 +398,7 @@ static bool rtw_usb_tx_agg_skb(struct rtw_usb *rtwusb, struct sk_buff_head *list int agg_num = 0; unsigned int align_next = 0; u8 qsel; + int ret; if (skb_queue_empty(list)) return false; @@ -455,7 +456,13 @@ queue: tx_desc = (struct rtw_tx_desc *)skb_head->data; qsel = le32_get_bits(tx_desc->w1, RTW_TX_DESC_W1_QSEL); - rtw_usb_write_port(rtwdev, qsel, skb_head, rtw_usb_write_port_tx_complete, txcb); + ret = rtw_usb_write_port(rtwdev, qsel, skb_head, + rtw_usb_write_port_tx_complete, txcb); + if (ret) { + ieee80211_purge_tx_queue(rtwdev->hw, &txcb->tx_ack_queue); + kfree(txcb); + return false; + } return true; } @@ -517,8 +524,10 @@ static int rtw_usb_write_data(struct rtw_dev *rtwdev, ret = rtw_usb_write_port(rtwdev, qsel, skb, rtw_usb_write_port_complete, skb); - if (unlikely(ret)) + if (unlikely(ret)) { rtw_err(rtwdev, "failed to do USB write, ret=%d\n", ret); + dev_kfree_skb_any(skb); + } return ret; } |